_____ are small icy bodies that orbit the Sun and produce tails of gas and dust when they approach the Sun
A) Comets
B) Asteroids
C) Meteorites
D) Stars
A
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The early atmosphere of Earth had much less oxygen than today. How has Earth's oxygen abundance increased over Earth's history?
A. Ultraviolet light breaks up ozone into oxygen. B. Volcanic eruptions release large amounts of oxygen. C. Cometary impacts over Earth's history have contributed oxygen to the atmosphere. D. Plant life generated oxygen through photosynthesis. E. None of these choices are correct.
The Sun rotates ________ at its equator compared to near its poles.
A. slower B. backwards C. the same D. faster
Which moon of Saturn constantly changes its rotational speed and rotational axis?
A) Mimas B) Iapetus C) Hyperion D) Calypso E) Janus
How is an X-ray burst (in an X-ray binary system) similar to a nova?
A) Both involve explosions on the surface of stellar corpse. B) Both typically recur every few hours to every few days. C) Both are thought to involve fusion of hydrogen into helium. D) Both result in the complete destruction of their host stars.